Then it is non-skeuomorphic.
And they have been removing it bit by bit since they kicked out Scott Forstall.
I don’t think he’s actually working anywhere that could be bought, though.
Except with a stack of cards (or pages) the bottom page would not be moving. The visual is more reminiscent of some sort of assembly / processing line.
At least iOS lets you change the font size for each application independently, which is a feature that I make heavy use of. I like larger fonts, but sometimes this results in text being truncated too early, and being able to selectively reduce the font size makes it feasible to have a larger default font size. For whatever reason this is not possible on Android, and changing the font size takes several seconds to kick in, so even manually boosting the font size for certain cases via a shortcut or automation is annoying.
That being said, I've used Kindle for years because it's online etc. They have had this same feature for years on their mobile versions so I don't get how this was a killer feature of Books.
[EDIT] Two key real-book-reading behaviors this enabled, that a non-interactive page flip animation (which I personally find a ton worse than no animation) does not:
1) You could "play" with the corner and edge of the page while reading. Great for fidgeters, and analogous to what some of us do when reading real books.
2) You could start to flip the page as you were nearing the end of the current page.
But the animation is disabled by default and lately I've stuck with the regular sliding animation because it's faster and much less obtrusive. It also lets you start turning the page as you're reading the last line.
Apple has an intense culture of dogfooding, so it would surprise me very much if someone in a leadership position didn't experience the new page-flipping animation, much less explicitly approve its design.
That’s not really a change you miss if you do any QA of that app at all. And if it was missed that’s even worse for Apple than if it was a conscious choice.
No one has ever designed a physical book that works anything like the new page-turning approach, and you have to believe there's a reason for that.
But what I could imagine is that it fell out of product oversight and an engineer just came along and said "well that's a really complicated piece of code, I don't want to maintain that, I'll replace it with something simple", and nobody pushed back because this isn't a high-priority feature any more